Hi Luc!

I happen to own both the M22's and the M60's. As much as I prefer my M60's, I honestly wouldn't spend another $1000 to replace the M22's which happen to be in the same size room as yours. I'm very satisfied with the output of the M22's and they are only being powered by a 40wpc Rotel amp. Can you perhaps be more specific about what you're unhappy with?

M60s
VP150
QS8s
Marantz SR6003
Samsung LN52B550
Oppo DV-980H
Insignia NS-WBRDVD